Means for mounting magnets or the like within switch casings



E. BESAG ET AL MEANS FOR MOUNTING MAGNETS OR THE LIKE W'ITHIN SWITCH yCASIMGSk oct. 13; 1953 Filed Jan. 5l, 1949 mt QJm-Imf mj By l M Ano'rneya.

Patented Oct. 13, 1953 MEANS FOR MOUNTING ,MAGNETS ORTIE LIKE WITHIN SWITCH CASINGS Ernst Besag, Streetly, and Thomasjl). 1G. Wintle,

Birmingham, England, assignorsto JA. Grabtree ..& 10o. Limited, Walsall, England, aBrit- ,ish company Application January 31, 1949, Serial No. 73,834 In Great Britain June 9, 1948 4 Claims. 1

"This invention relates to improvements 'in electro-magnetic switches, and has as .its principal object the provision of Aa simple means for mounting the magnet so as to absorb shocks on impact of the armaturek thereon, for the purpose of minimizing Contact wear. A further object is the 4provision of an accurate mounting for the magnetand for the armature, to thereby ensure correct replacement, andto facilitate the removal of parts without necessitating the employment of tools.

According to this invention, the magnet is removably mounted vin a 'frame secured to the switch casing, which frame is adapted to impart resiliency for the purpose 'of labsorbing shocks. The frame may be of U-shape, its connecting limb being secured to the rear plate of the switch casing, while its side arms are slotted or apertured for engagement with lateral projections n the outer surface of the opposite sides or ends of an E-shaped laminated magnet. At the junction of each side Wall with the connecting limb, a bend or bead is formed for imparting the desired degrees of resiliency upon the impact of the armature on the magnet. For ensuring the correct mounting of the magnet in the frame, the slots in the frame and the projections on each side or end of the magnet may be differently arranged or formed. The slots and projections are preferably disposed on an axis passing through,

or adjacent to, the centre of gravity of the magnet, to ensure that avoidable opening forces on the faces of the magnet are not introduced. Similar projections may be formed on the armature for ensuring its correct disposition in an insulating traverse or carrier.

In order to enable the invention to be readily understood, reference will now be made to the accompanying drawings, illustrating, by way 0f example, one construction for carrying the invention into effect, in which drawings:

Figures 1, 2, 3 and 4, are respectively, perspective views of the armature traverse, the armature, the magnet and the frame mounted on the switch plate, and

Figures and 6 are sections on the line X-X of Figure 4, showing the frame (with the magnet in chain lines), in different positions thereon.

Referring to the drawing, the magnet a and the armature b are of similar construction, each being formed on each side or end with differently formed projections c, those on the armature being engageable in shaped recesses d in an insulating traverse or carrier e, while those on the magnet are engageable in slots j in the side arms of a (Cl. S17- 1195) 2 Ueshaped frame g. y'.lnefr.ecessesrl in thetraverse andthe slots .f inthe frame lare diferentlrshsped for :.accoinnindating the Vprojectinns `and ensuring that fthe armature :and `magnet, :respectivelyf only ,be mounted u'the correct positicn. E17-his frame gis formed with aakeyholeslot h iniits @Qnnecting limb, and the rear nlate i cf :the switch casing has a .headed niiet vit',prmev.ting therefrom.

The magnet is sprung into `position 1in- :the frame, the differently snapedznmiectionac ensurincite correct disposition therein. lnimcuntins the frame, and the magnet, r`on the plate 411,the circular portion of the tslot h is passed foyer the headed rivet k, and thejframeigisithenmmied194terally toward the left the'posliionshownin Figure 5 to the position shown in Figure 6, so that the head of the rivet 7c engages over the edges of the walls defining the rectangular portion of the slot h for returning the frame against forward withdrawal. The frame g is resiliently held against lateral movement by the engagement of a small protuberance m, on the front face of the plate i, in a hole n in the frame g. 'I'he plate i is also formed with a forwardly projecting hook o which enters the keyhole slot h and ensures the correct assembly of the frame and magnet thereon.

The front of the traverse e carries moving contacts t, and it is formed, on its rear face, with a deep recess in which is secured a bracket p for carrying the armature b. An arm p1 extending rearwardly from the upper part of the bracket p is adapted to extend into a slot u in the armature, a securing pin 1- then being passed through a vertical opening u1 in the armature and an aperture p2 in the arm p1. The lower part of the bracket is formed with feet s which serve for supporting the traverse on a pivotally mounted carrier which is not shown.

We claim:

1. Means for mounting a magnet Within the casing of an electromagnetic switch, comprising a magnet having axially extending projections at the opposite ends thereof, each projection being of different external configuration, a substantially U-shaped bracket including side arms having apertures of different configuration corresponding, respectively, to the configurations of said projections, each of said apertures receiving therein the projection of corresponding connguration whereby the magnet is supported between said side arms, the difference in configuration of said projections with respect to said apertures insuring correct mounting of said magnet in said bracket, and means for securing the bracket to the casing of said switch.

2. Means for mounting a magnet within the casing of an electromagnetic switch, comprising a magnet having axially extending projections at the opposite ends thereof, each projection being of different external configuration and at least one of said projections having a iiat side surface, a substantially U-shaped bracket including side arms having apertures of different configuration corresponding, respectively, to the coniigurations of said projections, at least one of said apertures being deiined by a Awall having a flat surface complementary to the flat side surface on said one projection, each of said apertures receiving therein the projection of corresponding configuration whereby the magnet is supported between said side arms, the difference in yconfiguration of said projections with respect to said apertures insuring correct mounting of said magnet in said bracket and engagement between the nat side surface of said one 20 projection and the complementary flat surfaces of the wall defining the aperture Iwhich receives said one projection preventing rotation of said magnet within said bracket, and means for securing the bracket to the casing of said switch.

3. Means for mounting a magnet within the casing of an electromagnetic switch as defined in claim 2 wherein the axially extending projections at the opposite ends of said magnet are rectangular in transverse cross section with one projection of greater transverse cross section than the other, and wherein the apertures in the side arms of the bracket are rectangular and correspond, respectively, to the transverse 'cross section of said projections.

4. Means for mounting a magnet within the casing of an electromagnetic switch as defined in claim 2 wherein the apertures in the side arms of the bracket and the projections on the opposite ends of the magnet are disposed on a line which passes substantially through the horizontal axis of the center of gravity of the magnet when said magnet is mounted between said side arms.

ERNST BESAG. THOS. D. G. WINTLE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 657,683 Swearingen Sept. 11, 1900 693,127 Gardner et a1 Feb. 11, 1902 998,023 McCann July 18, 1911 1,225,525 Sweet May 8, 1917 1,571,762 Driscoll Feb. 2, 1926 1,766,577 Willing June 24, 1930 1,805,016 Schwartz May 12, 1931 2,097,071 Lichten Oct. 26, 1937 2,291,870 Blair Aug. 4, 1942 2,434,096 Ayers Jan. 6, 1948 2,466,382 Coake Apr. 5, 1949 2,513,161 Friend June 27, 1950 FOREGN PATENTS dumber Country Date 437,955 Great Britain Nov. 5, 1935 452,598 Great Britain Aug. 26, 1936 543,190 Great Britain Feb. 13, 1942 

